Calculating-machine.



J. G. DUNKER.

Patented Aug. 6, 1918 3 SHEETSSHEET I.

l. G. DUNKER.

CALCULATING MACHINE.

APPLICATION FILED SEPT. 1. 1915.

1,274,526. Patented Aug. 6, 191&

2 Z 3 SHEETS-SHEET 2- J. G. DUN'KER.

CALCULATING MACHINE.

APPLICATION FILED SEPT. 1. 1916.

1,274,526. Patented Aug. 6, 1918.

3 SHEETS SHEET 3- A Umrnn srarns rarnur ()FFIGE.

JOHN G. BUNKER, orciIIcAeo, ILLINOIS, ASSIGNOR -TO THE'WAHL COMPANY, on

.- CHICAGO, ILLINOIS; A CORPORATION or DELAWARE.

CALCULATING MACHINE.

Specification of Letters Patent. Pat t g, ,191

Application filed September 1, 1916. Serifl No;- 118,147.

To all who-m it may concern?- Be it known that I, Joi in DUNIIER, a citizen eithe -United States, residing at Chicago, inithe county of Cook and'State of Illinois, haveinrented certain new and useful Improvements in Calculating h/lachines, of whiclrthe'following is a specification.

My invention is a totalizer clear signal for computin'g-ma'chinesVand is especially adapted for use with computing machinesin which the totals are copied figureby figures One of the objectsofmy invention is to improve on" the totalizer clear signals ofthe prior: art both in structure and'ease of oper'ationi 1 Another object of=1nyinvention is to provide a-totalizer clear'signal whiclris adapt ed to be used with a typewriter computing machine, audwhich will givean indication as soon as a wrong digit is printed-in any decimal place instead ofhaving to wait until the total has-beenentirely printed before giving an'indication that an error has been made in copyingithe total exhibited by the totalizerg Another object of my invention is the prorision-ofn totalizer clear signal which can he-'slii-:ttetl-from the control of one tot'alizer to another, and will thus cooperate with either of said totalizers. This feature is especiallyyaluahlta in the machine on which I havejillustrated my invention,= via, the lVahl-cross footing machine Said machine has aplurality'o'f t-otalizers aclaptedto om pute nfumhe'rs written iii-vertical columns; There is alsoa cross'footing totalizer adapted to compute numbers written in a horizon-- tal line. My totalizer' clear signal is so constructed that=it may he brought into cooperation with any otthc Vertical totali ers-or into cooperation-with the cross totalizer as nay he desireda These, and-otherobjects of my inventiomwill be more fully set forth in the following specification and claims.

The invention may behest understood by reference'to the followingfigures'of which- Figure 1 is a front ele a'tion'of a' iVahl cross footing machine equipped with my invention. 1

Fig. 2 is a partial'section along the lines 22 of Fig; 1. 1

Fig. 3 is a detailof a master wheeland some of the totalizer i'v'heels in section.- V

Fig- 1. is a perspective view of some of the parts which are: peculiar to my herein d'is closed invention.

Fig. 5 is a detailof the part of the special its connections,

Fig. 6 is 'a detail otthe typewriter bar, and v Fig. 7 is a detail of a certain mechanism.

Similarcharacters of reference refer to like parts throughoiitthe several views.

Reference to Fig. 7:1 will disclose a lVahl cross footing machine, and since thismachine is well known commercially, it'will not be necessary to give ail-extended description herein. It will be sufficient to'say that the carriage of the typewriter is equipped with a t-raYeling truck 10upon whichis mounted a plurality of tota-lizers 11, 12, 13 and 11-. These totalizersnre adaptedto' have numbers insertedin-them serfatimhy a master wheel 15, whichxisrotated' a differential amount upon 'the operation of any of the numeral keys 16 of thetypewriter 17.

For the sake of clearuess, in Fig. 1 I have shown a typewriter in whichthe usual alphabetical keys are absent. However, it is to'be understood that the lVahl cross toot ing ma'chine; is usually mounted one typewriter possessingithe full equipment of alphabetical keys in addition -to the numeral keys necessary to operate the computing attachment.

The Vertical totalizcrs 11,- 12, 13 and 1 1 are equipped with means for intermittently picking-up the cross totalizer 18-which is mounted on the truck 19 rcciprocating in ways 20, rigid with the frame work of the machine. A spring 21 serves to hold the cross totalizer 18 in its "normal position, as shown in Fig.-:1, and a pick-up heam-22 is attached to the truck 19 and adapted to cooperate with connecting locations (not showir) on the totalizers 11, 12, 13 and 1%. The mechanism just described has for its purpose the picking up of the cross totalizer 1-8 and causing said totalizer to travel with the truck 10 during the time the vertical totalizers :11, 12, Band 1 1 are engaged with the master wheel- 15. -11 cross master wheel 23' scrvesgto insert numbers inthe cross to talizer 18 simultaneously with the insertion of these numbers in any of the vertical totalisers, the master wheels 23 and15 revolvpart of the key for printing the characteristic mark and 7 ing equalamoun ts upon the operation of any;

of the numeral keys 16. V The vertical totalizers 11', 12 and 14' are provided-with cams 24:, 25 and 2 6, which are adapted to contact with a roller 27 on an arm 28, which is connected to a gearshift device which controls the rotation of the master wheel By means of these cams, a definite progral'n of 'ca'lculati'on for the cross total izer 18 may be set upgon'the truck 10, and thus as numbers are written in horizontal alinement', the direction in which these numhere are entered into the crosstotaliz'er-lS is automatically determined.

v: [It will not be necessaryto go into a description of the mechanisms by which the 7 above recited results are brought about since said mechanisms are all parts of the Wahl'cross footin i machine whlch has been on the market for. some time. 1

Ishall startthedescription of parts p culiar to 'my invention witlrthe' premise that operation of the numeral keys '16 causes a differential rotation of the ertical master wheel 15- and the cross master'wheel 23, the rotation of the latter being-in a direction determined bythe contact of one ofthe cams 24,25 and26 with the roller 27. After the number corresponding to the key depressed has been insertedin'th'e totalizersy the typewritter carriage escapes :one step and themaste'r wheels 15 and 23 engage in the neXt lower decimal place of their associated totalizers. Numbers are inserted in the machine one digit at a time. @Whenit is wished to clear any of the 'totaliiiersthe numbers shown 'thereon are subtractedyf For in stance, if the cross totalizer'shows'a total of 563, it'will be necessary to set the master wheel 28' to subtraction, tabulateto the hundredths position and thenpperate, in the order named, the 5, 6 and3 keys. This will result in the subtracting of 563 from the cross totalizer 18, which will thenstand at 'zero. However, it sometimes happens that r the operator will incorrectly readthe number present in the totalizer and subtract either too much ortoolittle which results i give the operator an indication that an inin" the; totalizer not being clear;

it is one of theobjects' of my invention at the time anerror is made innnediately'to correct, number has been subtracted from the totalizer, and as will hereinafter be d1s closedgthis indication is given when the erroneous digit is subtracted. The operator does not have to waituntil the entire number has beenwritten out before discovering anerror.

"Describing now'theparts peculiar to my invention, reference to Fig {will disclose that the WhGQlSjQQtUICtBO, which maybe taken as typical wheels of the cross and 'veu tical totalizers, are made with a key hole shaped notch 31 between two of their teeth.

Ihenotch 31 is so positioned reference to the number wheels of the totaliier that when the number wheels stand at O, this notch opposite a knob 32 on'a bar 33- (Figs. 1 and 4) slidably mounted on a plate34- of the framework of the machine. Two screws "35 and 86 which go through elongated slots said bar in its proper position in respect to etheplateflt. The position of the bar 33 controlled by the lever 39 pivoted to the plate3 1 at 40, and having a noser ll which 37 and 38 in the bar. 33 serve to maintain engages a slot L2 in the lower end of the r bar33, and adownwardly extending arm 43.

which isadapted to .contactwith a lever on a shaft 45 which is rotatably and slidably I mounted in the framework supporting the cross'totalizer. A spring 46 extending be tween thezarm and a stud on plate 34 serves to hold said arm, andwithit'the bar 33, in thepositiom-as shown inFig. 4. The

actuator for-the vertical" totalizers is equipped with a similartbar "47 having a V knob -48 i. adapted to' engage with key-hole notches 31 in the wheels of the vertical totalizers, said bar 47, being maintained in its depressed .positionby an arm 49. of a bell crank pivoted to'a plate of the framework at 53, and held in a normal position by a spring 51, said arm 49 engaging in a slot 50 in .the bottom of the bar 47. 1

Leaving for a moment the action of the bar47 and returning to consideration of the bar 33 which-cooperates with the cross total izer, reference to Fig. i l will disclose that the shaft 45 which, it will be remembered,

is both rotatably and slidably mounted in the framework, has rigidly attached to it an,

arm 52, which has an ear 5% cooperating with notches 55- and 56 inan escutcheon between the collars 58 and: 59rigid:on said shaft is a handle 60 to which is attached a plate 57. Loosely mounted on the shaft' l5 pointer 61, havin an ear 62 thereon to embrace the es-cutcheon plate 57. On the arm 52 is pivoted at 66 a detent 63 held in contact with alatoh plate 6-1 by a spring 65c):- tending from said detent to an extension 67 onfthe arm 52 (Fig. 5).; 'The arm 52also .contains a slot 68 in wh'ich isa pull rod 69 extending to a special key leverFO of the typewriter. This special key leverhas a-t-- sheet,iand=by means" of the-rotation of the arrn52, the consequent rotation ofithe shaft 45 which results in elevating the-bar .33 into a position where the knob 32 will be in line and adapted to enter the key hole. shaped notches 31 in the gear wheels 29 of the cross totalizer. The detent 63, by engaging with the underside of the latch plate G 1, will serve to'maintain the bar 33 :in its raised position. The-typewriter carriage will then be tabulated, or spaced step by step, to the highest significant figure appearing in the cross-totalizer 18. Since,- by hypothesis, all the .wheelsof the totalizer to the leftof the said highest wheel stand at 0, the notches 31 of said wheels will be in line and this fact will permitthe passage of the totalizer over the knob 32 and said knob through key hole notches 31. digit is printed out, the notch in the wheel 29 in that decimal place will be brought into line with said knob 32, and further escape ment of the typewriter carriage is permitted. This process will continue until the entire number present in the totalizer has been printed out, in which event the knob 32 will be engaged in the wheel 29 in the lowest decimal place of the totalizer, and the truck 19 will be permitted to return to its normal position without interference whenv the same shall have been unlatched from' the vertical truck 10. Assume, however, that during the printing of this total one of the wheels 29 was not-returned to 0. Further spacing ofthe typewriter carriage would then be prevented by reason of the fact that the notch 31 was not in alinement with the knob 32. This would at once call the attention of the operator to thefact that an error had been made in the particular decimal place operated in. Such an error would be corrected by reversing the direction of rotation of the master wheel 23 and inserting the erroneous number, and then throwing the machine again into subtraction and printing out the correct number. It will thus be seen that the procedure of clearing out the cross totalizer is as follows:

The characteristic mark is first printed, then the totalizer tabulated, or spaced step by step, to the highest significant digit and the number in said totalizer printed out digit by digit. In case this is correctly done the machine will function in the usual manner. In case, however, an error is made in the printing out of the digit from any decimal place, spacing of the typewriter carriage will be prevented and the fact of the machine being tied up will direct the attenti on of the operator to the error.

Considering now the operation of the de vice upon the vertical 'totalizers, reference to Fig. 4- discloses that rotatably mounted on the shaft 45 is an arm 7 2 which is held in its position by anear 73 (Fig. 7) attached to the f amework in any suitable manner. Mounted on the arm 7 2 is a pin 85, which is lVhen the highest significant adapted to enter a hole Tel in the arm 52 when. the shaft 45 is shifted so that the pointer 61 is under-the V in the escutcheon plate 57. hen in;this position the ear will register witlrthe notch and operationof the special key 71.will, therefore, rotate the arm 72, which is connected by. a link 7 5 to aniarm .76 rigid on a ack shaft 77 rotatably mounted in the framework. On said shaft '77 is rigidly mounted an arm 78, which serves to operatea depending arm 79 of. the bell crank formed with arm 49. When it is desired to extract the total from one of the vertical totalizers, the handle 60 is shifted so thatthepointer 61 is below the V on the plate57, and when. in tlllSzPOSltlOll, operation. of the special key 71 will .raise not the bar 33 of the cross totalizer but:the bar d7 which is adapted to engage the vertical totalizen, These vertical totalizers may then. be cleared as described in connection with the cross totalizer 18 and an error in extractingathe proper number from any of the decimal places of said verticaltotalizer will at once, by preventing the spacing of the. typewriter carriage,v give the operator a warning that the mistake has been made.

The knobs 32' and t8 OfQtLCll'biLl' and 4:7 are larger in diameter than the width of opening leadingfrom the root of the teeth to the notch. 31 .of the wheels 29 andBO, such construction making it necessary that the totalizer to be cleared is to the right of the master wheel when the key 71 is de pressed.- 7

InFig. 2 I have shown a vertical totalizer partly in section,v and it will beobserved that the particular wheel 30 shown in said section has in it three notches 31, these notchesbeing spaced at a distance of 10 teeth apart, eachnotch corresponding to the 0 position of thenumeral wheel 80 in the same decimal places as the wheel 30.

The elongated notch 68 in the arm is for-the purpose of'allowing thekey 71 to return toits normal position while the-arm 52 remains latched down by the detent 63. After a total has, been printed out, the detent 63 is, ofeourse, unlatched by means of the finger piece 81 and the parts returned to their normal. position under the influence of thespringelG or the spring 51 according as the total clearing device has been used with the cross or vertical totalizer.

Another mode of operating the device would be to depress thearm 52 by means of the finger iece 81 without operating the special key (.1.' The tote. .1 er would then be tabulated to the space before the first significant figure, this tabulation being permitted onaccount of the alinement with the key hole shaped notches. The special key would then be operated, which would print the sta r, and the carriage would space one space, thus bringing the wheel in the decimal place & a

of the first significant figure'in a position to be operated on by the master wheel. v, The total would then .beprinted out digitby digit,and the notches 31 brought into alinement. The procedure just described would obviate theinecessity of a-space between the characteristic mark and the highest-significant figure of the total printed out.

Many advantages result from my improved 7 device'herein' described. In all the devices of the prior art with which I am acquainted the indication that the 'totalizer has not been cleared was not given until the operator had entirely printedout the total in the totalizer and attempted to print the characteristic mark usually employed as an indicationthat the totalizer is clear. In my device, the characteristic'mark is printed first and then fail are to properlyclear any decimal places of the totalizer results in the tyingup' of the machine. The operatoris at once notified of the error and must correct it immediately without having to wait until her has been printed. -V V I do not-wish to restrict myself to the precise structure herein disclosed, since many modifications may be made therefrom without. departing from the spirit ofmylinven- 'tion, since I claim: w

, tion-of a'vtotalizer gear wheel, a keyhole SlOhlll said gear wheel,:thereby determinlng' 1. In "a calculating machine, the com-bina the zero position of said-wheel, and a plun per having an enlarged end to enter sald s 0t, and means to bring said plunger m contact with said wheel and thereby mechanicallyid'etermine whether or not said wheel is in its zero position.

2. In a calculating machine, the combination of a'tota'lizer, a set of numeral wheels having key hole 'slotsin them to thereby determinethe zero position of said wheels,

' a plunger having a head adapted to enter said slots, and means to bring said plunger in a position toengage said slot and afterward contact with said wheels seriatim.

3. In a calculating machine,'the combination of a totalizena-wheel having a key hole slot therein to thereby determine a zero po'' sition, a plunger lslidably-mounted 0n the' framework of the mach1ne,;sa1d wheel and plunger being relatively movable to each other, and means to elevate said plunger into the path of said Wheel. V r t 4. In acalculatin 'machine, the combina.

'tion of aset oi totalizer wheels having a confi uration )eculiar tothe zero osition thereof, a zero determining .device adapted to coopearte with said wheels, 'means for said zero determiningTmeans printing a characteristic mark, and means conne'ctlng sa1d printing means and saidzero determining means and adapted to bring with said totalizer. I

5 111 calculating machine, the combinathe entire numin cooperation cooperation with said totalizer;

tion of a setiofito'talizer wheels havinga configuration peculiar to the rzeroupoition thereof, azero determining device'adapted to contact with saidtotalizer wheelsseriatz'm, means for printing a characteristic mark, and means eonnectingsaid printin means and'said zero determining meansand ad'apt ed to bring saidrzero determining means in cooperation with said ,totalizer.

6..In a calculating machine, the combina tion of a totalizer having'a set. of gear wheels, a second totalizer also having a set of gear wheels, a zero determining device. adapted toxcontact scm'at-im with-said first totalizer, a sccondszero determining device adapted" to contact sefiatc'm with t the wheels 'of said second totalizer and manually operated means to determine Which of said-zero determining devices shall be brought into 00-.

operation with its respectiveitotalizer.

I 7. In a calculating machine,the combinar brought in contact with said wheels scriati/m,

a second totalizer, a series-0f wheels therein, a second Zero determining device adapted to be brought. in contact with said wheels semam, means for printing a characteristic mark and bringing one or the other of said zero determining devices in connection with its respective totalizer,-and means for determining which zero' determining device shall be operated by said printing means.

9. In a calculating machine, the combination of a totalizer including a set of wheels, a Zero determining device adapted to be brought in contact'with said wheels scm'am'm,

7 a second totalizer, a series of wheels therein,- a second Zero determining device adapted to be brought in' contact with said wheels '88- V rz'dzfim, and means for printing a characteristic mark and bringing one or the other of said zero determining devices'in contact with its respective totalizer. V

10. Ina'calculating machine, the combination of a decimal, carriage, a totalizer, and a zero determining *device adapted to be brought into cooperation with said totalizer, the arrangement of the totalizer and zero determining device being such that motion of said decimal carriage will be prevented unless said totalizer stands at Zero during the time said zero'determining device is in 11. In a calculating machine, the combination of a decimal carriage, means to advance said decimal carriage in a letter feeding di rection, a totalizer, a Zero determining de vice, means to bring said zero determining device into cooperation with said totalizer, and means to prevent the motion of said decimal carriage in a letter feeding direction during the time said zero determining device is connected to said totalizer.

12. In a calculating machine, the combination of a totalizer, a set of members having slots therein, a plunger adapted to be brought into cooperation with said members, and means to advance said members in one direction relative to said plunger, the arrangement being such that advancing means will be inoperative unless said slots are in alinement with said plunger.

13. In a calculating machine, the combination of a totalizer including a set of wheels,

a zero determining device adapted to be brought into cooperation with said wheels scm'mfim, a second totalizer, a second series of wheels therein, asecond zero determining device adapted to be brought into cooperaion with said second set of wheels scrictz'm, means for printing a characteristic mark, a common operating means for actuating said printing means and bringing one or the other of said zero determining devices in cooperation with its respective totalizer, means for determining which zero determining device shall be operated by said printing means, and means for preventing the operation of said printing means unless said determining means is in either of its alternate positions.

In witness whereof, I have hereunto subscribed my name.

JOHN G. DUNKER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

